See link

We shouldn't link to the source-docs from our user-facing UI. Could we create a SUMO page instead and link there?
I also recommend putting the learn-more link target in a pref then it's easier to change after the fact.

Here is an example: https://searchfox.org/mozilla-central/rev/9b8ebf06145feeccf34dc126cf45b07e86556392/browser/components/preferences/privacy.js#283-290